Re: Simple proxy setup

Hi Mikl,

It is strange that the proxy is not aware about what the printer can do, if
I just do exactly the same request from my Linux Device, it works just
fine.
Requesting and caching could be an option, however, on the internet I can
read that just this single line in het snmpd.conf file should make it work.

the command lines I am executing are:

snmpget -c public -v 2c *IPaddress* 1.3.6.1.2.1.25.3.5.1.1.1

where the IPaddress is the ipaddres from the linux device or the printer.

I do not have any further source code I guess?? and which binaries do you
mean?

Kevin

2017-09-22 12:13 GMT+02:00 Michael Yarochkin <
[email protected]>:

> Hello, Kevin
>
>
> I am also new. Also still looking my way in SNMP. So, probably can not
> help a lot.
>
> But have some ideas about your problem.
>
>
> Looks like, your Linux proxy is not aware about what Printer can do. Is it
> a way to "request" and "cache" MIB from Printer on Proxy? Or "blindly"
> resend request, wait for response and resend it?
>
>
> PS. By the way: can you share your source code and also win binaries, if
> you can. Please. As i said, i am very new in SNMP. Will be happy with any
> examples.
>
>
> Mikl
> ------------------------------
> *From:* Kevin ten Braak <[email protected]>
> *Sent:* Friday, September 22, 2017 10:50:55 AM
> *To:* [email protected]
> *Subject:* Simple proxy setup
>
> Hi all,
>
> I am a newbie to SNMP and its configuration, so my apologies for asking a
> question that might have a very simple answer. However, I have been
> searching on the internet for some time now, and I just cannot figure out
> what I am doing wrong.
>
> Context:
> I have an HP Color Laser Jet Printer which is connected by ethernet (port
> 1) to a Device running Ubuntu 16.04 and having two ethernet ports. From my
> Windows (10) laptop, which is connected to port 2 of the Linux Device, I
> want to have SNMP connection with the printer. For example, I want to be
> able to ask the OID 1.3.6.1.2.1.25.3.5.1.1.1 (hrPrinterStatus.1) from the
> HP printer (having Static IP 190.168.6.132) by just sending a SNMP request
> to my Linux Device (having IP 190.168.6.133 on port 1 and IP 190.168.6.134
> on port 2).
>
> What I did:
> I setup as wel as an agent as an manager (manager was unnecessary) on the
> Linux Device as specified here:
>
> https://www.digitalocean.com/community/tutorials/how-to-
> install-and-configure-an-snmp-daemon-and-client-on-ubuntu-14-04
>
> As far as I know, this can simply be solved by using a proxy.
> This is why I added the line
>
> proxy -v 2c -c public 192.168.6.132 .1.3
>
> to my snmpd.conf file.
>
> However, when I do a snmp request from my laptop, to my Linux Device. I
> get "No Such Instance currently exists at this OID" / Agent response
> reported an Error Status of NoSuchName.
> Apparently my SNMP request still looks for the OID at my Linux Device,
> which isn't a Printer and therefore does not have the OID I am asking for.
>
> Question:
> I am able to do SNMP requests from my Laptop to my Linux Device, and from
> my Linux Device to my Printer. However, I want the Linux device to just
> forward the requests to my Printer. I do not want any SNMP requests for
> asking OIDs from my Linux Device itself, only the Printer. Preferably I
> would like to just use the 'public' community.
> Can anybody help me out? Below you can find my current snmpd.conf file
> (also in attachment)
>
> Thank you in advance!
>
> Best regards,
>
> Kevin
>
> snmpd.conf:
>
> ############################################################
> ###################
> #
> # EXAMPLE.conf:
> #   An example configuration file for configuring the Net-SNMP agent
> ('snmpd')
> #   See the 'snmpd.conf(5)' man page for details
> #
> #  Some entries are deliberately commented out, and will need to be
> explicitly activated
> #
> ############################################################
> ###################
> #
> #  AGENT BEHAVIOUR
> #
>
> #  Listen for connections from the local system only
> #agentAddress  udp:127.0.0.1:161
> #  Listen for connections on all interfaces (both IPv4 *and* IPv6)
> agentAddress udp:161,udp6:[::1]:161
>
>
>
> ############################################################
> ###################
> #
> #  SNMPv3 AUTHENTICATION
> #
> #  Note that these particular settings don't actually belong here.
> #  They should be copied to the file /var/lib/snmp/snmpd.conf
> #     and the passwords changed, before being uncommented in that file
> *only*.
> #  Then restart the agent
>
> #  createUser authOnlyUser  MD5 "remember to change this password"
> #  createUser authPrivUser  SHA "remember to change this one too"  DES
> #  createUser internalUser  MD5 "this is only ever used internally, but
> still change the password"
> #createUser bootstrap MD5 temp_password DES
>
> #  If you also change the usernames (which might be sensible),
> #  then remember to update the other occurances in this example config
> file to match.
>
>
>
> ############################################################
> ###################
> #
> #  ACCESS CONTROL
> #
>
>                                                  #  system + hrSystem
> groups only
> ###view   systemonly  included   .1.3.6.1.2.1.1
> ###view   systemonly  included   .1.3.6.1.2.1.25.1
> view   all         included   .1
>                                                  #  Full access from the
> local host
> #rocommunity public  localhost
>                                                  #  Default access to
> basic system info
> ### rocommunity public  default    -V systemonly
> rocommunity public
>                                                  #  rocommunity6 is for
> IPv6
>  rocommunity6 public  default   -V systemonly
>
>                                                  #  Full access from an
> example network
>                                                  #     Adjust this network
> address to match your local
>                                                  #     settings, change
> the community string,
>                                                  #     and check the
> 'agentAddress' setting above
> #rocommunity secret  10.0.0.0/16
>
>                                                  #  Full read-only access
> for SNMPv3
>  rouser   authOnlyUser
>                                                  #  Full write access for
> encrypted requests
>                                                  #     Remember to
> activate the 'createUser' lines above
> #rwuser   authPrivUser   priv
>
> #rwuser bootstrap priv
> rwuser demo priv
>
> #  It's no longer typically necessary to use the full
> 'com2sec/group/access' configuration
> #  r[ow]user and r[ow]community, together with suitable views, should
> cover most requirements
>
>
>
> ############################################################
> ###################
> #
> #  SYSTEM INFORMATION
> #
>
> #  Note that setting these values here, results in the corresponding MIB
> objects being 'read-only'
> #  See snmpd.conf(5) for more details
> #sysLocation    Sitting on the Dock of the Bay
> sysContact     Me <[email protected]>
>                                                  # Application +
> End-to-End layers
> sysServices    72
>
>
> #
> #  Process Monitoring
> #
>                                # At least one  'mountd' process
> proc  mountd
>                                # No more than 4 'ntalkd' processes - 0 is
> OK
> proc  ntalkd    4
>                                # At least one 'sendmail' process, but no
> more than 10
> proc  sendmail 10 1
>
> #  Walk the UCD-SNMP-MIB::prTable to see the resulting output
> #  Note that this table will be empty if there are no "proc" entries in
> the snmpd.conf file
>
>
> #
> #  Disk Monitoring
> #
>                                # 10MBs required on root disk, 5% free on
> /var, 10% free on all other disks
> disk       /     10000
> disk       /var  5%
> includeAllDisks  10%
>
> #  Walk the UCD-SNMP-MIB::dskTable to see the resulting output
> #  Note that this table will be empty if there are no "disk" entries in
> the snmpd.conf file
>
>
> #
> #  System Load
> #
>                                # Unacceptable 1-, 5-, and 15-minute load
> averages
> load   12 10 5
>
> #  Walk the UCD-SNMP-MIB::laTable to see the resulting output
> #  Note that this table *will* be populated, even without a "load" entry
> in the snmpd.conf file
>
>
>
> ############################################################
> ###################
> #
> #  ACTIVE MONITORING
> #
>
>                                     #   send SNMPv1  traps
>  trapsink     localhost public
>                                     #   send SNMPv2c traps
> #trap2sink    localhost public
>                                     #   send SNMPv2c INFORMs
> #informsink   localhost public
>
> #  Note that you typically only want *one* of these three lines
> #  Uncommenting two (or all three) will result in multiple copies of each
> notification.
>
>
> #
> #  Event MIB - automatically generate alerts
> #
>                                    # Remember to activate the 'createUser'
> lines above
> iquerySecName   internalUser
> rouser          internalUser
>                                    # generate traps on UCD error conditions
> defaultMonitors          yes
>                                    # generate traps on linkUp/Down
> linkUpDownNotifications  yes
>
>
>
> ############################################################
> ###################
> #
> #  EXTENDING THE AGENT
> #
>
> #
> #  Arbitrary extension commands
> #
>  extend    test1   /bin/echo  Hello, world!
>  extend-sh test2   echo Hello, world! ; echo Hi there ; exit 35
> #extend-sh test3   /bin/sh /tmp/shtest
>
> #  Note that this last entry requires the script '/tmp/shtest' to be
> created first,
> #    containing the same three shell commands, before the line is
> uncommented
>
> #  Walk the NET-SNMP-EXTEND-MIB tables (nsExtendConfigTable,
> nsExtendOutput1Table
> #     and nsExtendOutput2Table) to see the resulting output
>
> #  Note that the "extend" directive supercedes the previous "exec" and
> "sh" directives
> #  However, walking the UCD-SNMP-MIB::extTable should still returns the
> same output,
> #     as well as the fuller results in the above tables.
>
>
> #
> #  "Pass-through" MIB extension command
> #
> #pass .1.3.6.1.4.1.8072.2.255  /bin/sh       PREFIX/local/passtest
> #pass .1.3.6.1.4.1.8072.2.255  /usr/bin/perl PREFIX/local/passtest.pl
>
> # Note that this requires one of the two 'passtest' scripts to be
> installed first,
> #    before the appropriate line is uncommented.
> # These scripts can be found in the 'local' directory of the source
> distribution,
> #     and are not installed automatically.
>
> #  Walk the NET-SNMP-PASS-MIB::netSnmpPassExamples subtree to see the
> resulting output
>
>
> #
> #  AgentX Sub-agents
> #
>                                            #  Run as an AgentX master agent
>  master          agentx
>                                            #  Listen for network
> connections (from localhost)
>                                            #    rather than the default
> named socket /var/agentx/master
> #agentXSocket    tcp:localhost:705
>
> proxy -v 2c -c public 192.168.6.132 .1.3
>
>
>
>
>


-- 

*drs. ir. Kevin ten Braak*
Design Engineer
[email protected] <[email protected]>
Mobile: +31 6 28036078 <+31%206%2028036078>
Phone: + 31 40 7516124 <+31%2040%20751%206124>


Sioux LIME
Mathware for hardware and software
Esp 405, 5633 AJ, Eindhoven
www.limebv.nl

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